I kinda doubt it, there will always be an advantage of being the defensive waller.

Sparring itself is pretty flawed when it comes down to it. It requires two people to engage on each other for it to go smoothly, but that rarely happens anymore.
More than half of the time, it's one person taking all the risk as the aggressor and then their opponent being defensive, safe, and playing reactively. If both players played as the latter, it'd just be two idiots standing there at a stalemate.

This thread is being hijacked to question pretty much every aspect of sparring though. Like, if there was a dream world where everyone pinged 1-5, everyone was active, offensive players were rewarded for stringing together combos and ****, and the better player always won, then ya, that'd be wonderful...